Speaker (1)

Description

Julio E. Rodriguez1 Jonathan Garavito1 Adam Sebastian Gutiérrez1

1, Univ Nacional de Colombia, Bogota DC, , Colombia

Polycrystalline composites with a nominal composition of Ca0.95Gd0.05MnO3/Ag were grown using the solid state reaction method. Thermoelectric properties were studied using Seebeck coefficient S(T) and electrical resistivity ρ(T) measurements. These transport properties were studied in the temperature range between 85 and 300K. The thermoelectric performance of was improved as a consequence of the decreasing of its electrical resistivity with Gd doping and Ag adding. The composite exhibits maximums values for the thermoelectric power factor, PF, close to 8 μW/K2-cm. However, the values decrease when the Ag is above 5% wt , because the Seebeck coefficient is deteriorated by the presence of large amounts of Ag particles. Thus, the behavior observed in the transport properties become these composites promising materials for use in thermoelectric devices for low-temperature applications.